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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Deletion
Deletion: Loss of a segment of DNA from a chromosome. An example is the cat-cry (cri du chat) syndrome which is due to loss of part of chromosome 5. A deletion is the opposite of a duplication.